Vet360 Vol 4 Issue 4 August 2017 Vet 360 - Page 8

REPRODUCTION Reproductive Hormone Assays In Dogs and Cats Dr Kate May BVSc (Pret), MMedVet(Gyn)(Pret), DipAC Lecturer Office: Room 3- Dr Kate May,BVSc (Pret), MMed- Vet(Gyn)(Pret), DipACT Department of Production Animals, Theriogenology, Faculty of Veteri- nary Science kate.may@up.ac.za In order to fully understand the application of certain hormone assays currently available in small animals, we need to briefly recap the physiology behind it all. The overall controlling structure in all reproductive pathways is the hypothalamus. The hypothalamus is a specialized ventral portion of the brain made up of various nerve cell bodies, such as the tonic centre, the surge centre and the pre-ventricular centre. The tonic centre is responsible for episodic (basal) release of the hormone, Gonadotrophin Releasing Hormone (GnRH). The hypothalamus is connected to the anteri- or lobe of the pituitary gland via the hypothalamo-hy- pophyseal portal system. Secretion of GnRH by the hypothalamus results in release of Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH) from the anterior pituitary (adenohypophysis). In the female, FSH stimulates recruitment and selec- tion of a cohort of follic W2FRf'F2Ц7W27V6W26R6vRfƖ6R&V6W2F֖BB7F'G2F6V7&WFR憖&BW7G&Fv6fPVvFfRfVVF&6FR&VV6Rbe4g&FRBЧfWC3c77VRBTuU5B#rV62B6&W7VBG&W6bFRF֖@fƖ6W26RFR7&V6rVBbW7G&Fg&FRF֒ЦBfƖ6R&V6W2F&W6BB7FVFW2FR7W&vR6VЧG&RFRFW2F6V7&WFR&RgVF'v$7W&vRv6GW&6W6W2Ă7W&vRv6&W7VG2fЦGW&FBgVFbFRF֖BfƖ6R6PFRfƖ6R2gVFVBFR6V2vFFRWvǒf&V@6'W2WFWV4’7vF6g&W7G&FF&vW7FW"ЦR6V7&WFFR&vW7FW&R2VvFfRfVVF&6&FFRFW2BFRFV62FW&Vf&P&WfVFrgW'FW"fƖ7V"FWfVVBGW&rFW7G'W2FRW6F26V7&WFbe4GW&rFW7G'W22VVvF&W7VBFR&V7'VFVBb6fƖ6W2GW&rFW7G'W2vWfW"FW6RfF&GV6RVVvW7G&FF6W6PFR&RgVF'7W&vRv$BĂ&WV&VBf"gVЧFBFW6RfƖ6W26&Vw&W72FRfVRFVVFW'2W&BbFW7G'W2FPVwFbv6FWVG2FR7V6W2ǖW7G&W07V6W2ƖR6w2B'6W2FW7G'W2v7Bf"&VvЦǒrF2FW&VgFW"bFW&R2&VV&V6vF`7F@FW'FP7GVFW0f7VG&rDU 6WFg FVâ#pRàFR